Here are some study ideas for task 1:
1) Print a collection of questions
Before you start writing any task 1 reports, it's a good idea to have an overview of the different types of questions that you might face. Try to get paper copies (printed) of around 10 different questions - it's useful to be able to see them all in one place. Your 'pack' of questions should include: a line graph, bar chart, pie chart, table, 2 different charts, 3 or more similar charts, process diagram, comparison diagram, life cycle, map.
2) Practise parts of reports
Instead of writing a full report, try writing 10 introductions - one for each of the questions in your 'pack' (see point 1 above). The next time you are studying, just focus on writing overviews. On a different day, practise describing percentages, or comparing numbers etc...
3) Use model answers
If you look through my task 1 lessons on this site, you'll find examples of the 10 question types mentioned in point 1. Use my answers as models, and try to copy my way of writing as closely as you can.